Abstract—In this study, different kinds of turns based RNP AR procedures such as flyby and RF will be introduced. For fly by turn radius at different altitudes will be calculated. Moreover, the relation between bank angle (α) and altitude (h) will be investigated and assessed for RF turns. At the end of the study, it is noted that for fly by turns at standard α (18o), the turn radius increases in higher altitudes. However, for RF turns, turn radius is considered constant as 7 nms and it is observed that α alters proportional with h. It is concluded that in order to keep same turn radius (7nms) at higher levels, aircraft needs to increase α. The results showed that α alters between 6º < α < 18º at 1,000<h<19,000 ft. 
 

Index Terms—performance based navigation, required navigation performance authorization required, radius turn, bank angle